Building sands

Bau-pappe,/. building (paper) board, -riss, m. bmlding plan, -sand, m. building sand, mortar sand. 

Example Cracking catalyst, milk powder Building sand Flour, cement Gravel, coffee beans... 

The bamboo worm (Clymenella) is aptly named, as it looks very much like a 4-inch (10-cm) length of bamboo. The body is made up of a small number of long segments with very few parapodia. Bamboo worms build sand- or mud-encrusted tubes and consume mud to obtain nutrients. 

Although most sand used for mortars is naturally occurring siliceous sand, crushing hard rocks such as dense limestones produces fines which, if correctly processed are suitable for use as building sands. 

BS 1199 Specifications for building sands from natural sources — sands for mortars for plastering and rendering , 1986. 

Building sands are sands, which may be calcareous or siliceous, suitable for use in mortars. 

Sand — Building sand is a granular material, generally in the size range 0.06 to 2 mm (e.g., BS 1377, 1975 BS 5930,1981). Concreting sand generally has a nominal upper size of 5 mm, with constraints on the particle size distribution (e.g., BS 882,1983). 

Power tools and power equipment of various kinds can be subject to vibration. The tool can be hand held, such as a building sand pad compactor, a chain saw or jackhammer, or it can be ridden in or on, such as a dozer or a blast-hole drill in an open-eut mine. 

Typical solids Flour, cement Cracking Building sand Gravel, coffee... 

Tar sand feed contains a certain portion of fine minerals that, if allowed to build up in concentration in the middlings, increases viscosity and eventually dismpts settling ia the separation cell. The drag stream is required as a purge in order to control the fines concentration in the middlings. The amounts of water that can enter with the feed and leave with the separation cell tailings and froth are relatively fixed. Thus, the size of the drag stream determines the makeup water requirement for the separation cell. 

Solids Some wells produce large amounts of sand and other soltds entrained in the fluid. Where solids are contained in the stream, suflicicnt velocity should be provided to assure they do not build up in the bottom of the pipe, causing higher than anticipated pressure drops or potciiiial areas for corrosion. However, if the velocity is too high, erosion m i. occur. (See Volume 1.)... 

Where 90° turns in piping are required, standard long radius ells (ell centerline radius equals 1.5 times pipe nominal diameter) are usually used. In sandy service, the sand has a tendency to erode the metal on the outside of the bend. Target tees, such as shown in Figure 15-25, are often specified for such service. The sand builds up against the bull plug and provides a cushion of sand that is constantly being eroded and subject to deposition by the sand in the flow stream. 

SILTSTONE Weight build up. Thin with water or chemicals to release sand by reduction In viscosity. Maintain adequate colldds. Centrifuge mud. 

Solvent-free high-build floor paints are available which can be readily applied with brush, roller or spray to a prepared concrete substrate to give a thickness of 0.10-0.20 mm per coat. Normally, two coats are applied and the first is often lightly dressed with fine sand or carborundum dust to give a non-slip, chemically resistant and durable colored floor, ideal for light industrial traffic conditions (for example, rubber-shod wheels). ... 

Insoluble suspended matter either picked up from the atmosphere or formed by deposition and corrosion within the system, together with slimes will, if not removed, cause blocking and abrasion problems. The build-up of such material can be controlled by side stream filtration, in which about 2-5 per cent of the circulating water flow is filtered continuously. A sand filter is commonly used for this type of duty. 

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